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Merge pull request #16565 from hashicorp/b-mapwriter-overwrites 

helper/schema: Clear existing map/set/list contents before overwriting
This commit is contained in:
Chris Marchesi 2017-11-06 08:33:11 -08:00 committed by GitHub
parent 4b1c7a1d9b 3fa11e456b
commit 1bed7deb8f
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 307 additions and 0 deletions
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32
helper/schema/field_writer_map.go
View File

@ -39,6 +39,19 @@ func (w *MapFieldWriter) unsafeWriteField(addr string, value string) {
w.result[addr] = value
}
// clearTree clears a field and any sub-fields of the given address out of the
// map. This should be used to reset some kind of complex structures (namely
// sets) before writing to make sure that any conflicting data is removed (for
// example, if the set was previously written to the writer's layer).
func (w *MapFieldWriter) clearTree(addr []string) {
prefix := strings.Join(addr, ".") + "."
for k := range w.result {
if strings.HasPrefix(k, prefix) {
delete(w.result, k)
}
}
}
func (w *MapFieldWriter) WriteField(addr []string, value interface{}) error {
w.lock.Lock()
defer w.lock.Unlock()
@ -115,6 +128,14 @@ func (w *MapFieldWriter) setList(
return fmt.Errorf("%s: %s", k, err)
}
// Wipe the set from the current writer prior to writing if it exists.
// Multiple writes to the same layer is a lot safer for lists than sets due
// to the fact that indexes are always deterministic and the length will
// always be updated with the current length on the last write, but making
// sure we have a clean namespace removes any chance for edge cases to pop up
// and ensures that the last write to the set is the correct value.
w.clearTree(addr)
// Set the entire list.
var err error
for i, elem := range vs {
@ -162,6 +183,10 @@ func (w *MapFieldWriter) setMap(
vs[mk.String()] = mv.Interface()
}
// Wipe this address tree. The contents of the map should always reflect the
// last write made to it.
w.clearTree(addr)
// Remove the pure key since we're setting the full map value
delete(w.result, k)
@ -308,6 +333,13 @@ func (w *MapFieldWriter) setSet(
value = s
}
// Clear any keys that match the set address first. This is necessary because
// it's always possible and sometimes may be necessary to write to a certain
// writer layer more than once with different set data each time, which will
// lead to different keys being inserted, which can lead to determinism
// problems when the old data isn't wiped first.
w.clearTree(addr)
for code, elem := range value.(*Set).m {
if err := w.set(append(addrCopy, code), elem); err != nil {
return err

275
helper/schema/field_writer_map_test.go
View File

@ -261,3 +261,278 @@ func TestMapFieldWriter(t *testing.T) {
}
}
}
func TestMapFieldWriterCleanSet(t *testing.T) {
schema := map[string]*Schema{
"setDeep": &Schema{
Type: TypeSet,
Elem: &Resource{
Schema: map[string]*Schema{
"index": &Schema{Type: TypeInt},
"value": &Schema{Type: TypeString},
},
},
Set: func(a interface{}) int {
return a.(map[string]interface{})["index"].(int)
},
},
}
values := []struct {
Addr []string
Value interface{}
Out map[string]string
}{
{
[]string{"setDeep"},
[]interface{}{
map[string]interface{}{
"index": 10,
"value": "foo",
},
map[string]interface{}{
"index": 50,
"value": "bar",
},
},
map[string]string{
"setDeep.#": "2",
"setDeep.10.index": "10",
"setDeep.10.value": "foo",
"setDeep.50.index": "50",
"setDeep.50.value": "bar",
},
},
{
[]string{"setDeep"},
[]interface{}{
map[string]interface{}{
"index": 20,
"value": "baz",
},
map[string]interface{}{
"index": 60,
"value": "qux",
},
},
map[string]string{
"setDeep.#": "2",
"setDeep.20.index": "20",
"setDeep.20.value": "baz",
"setDeep.60.index": "60",
"setDeep.60.value": "qux",
},
},
{
[]string{"setDeep"},
[]interface{}{
map[string]interface{}{
"index": 30,
"value": "one",
},
map[string]interface{}{
"index": 70,
"value": "two",
},
},
map[string]string{
"setDeep.#": "2",
"setDeep.30.index": "30",
"setDeep.30.value": "one",
"setDeep.70.index": "70",
"setDeep.70.value": "two",
},
},
}
w := &MapFieldWriter{Schema: schema}
for n, tc := range values {
err := w.WriteField(tc.Addr, tc.Value)
if err != nil {
t.Fatalf("%d: err: %s", n, err)
}
actual := w.Map()
if !reflect.DeepEqual(actual, tc.Out) {
t.Fatalf("%d: bad: %#v", n, actual)
}
}
}
func TestMapFieldWriterCleanList(t *testing.T) {
schema := map[string]*Schema{
"listDeep": &Schema{
Type: TypeList,
Elem: &Resource{
Schema: map[string]*Schema{
"thing1": &Schema{Type: TypeString},
"thing2": &Schema{Type: TypeString},
},
},
},
}
values := []struct {
Addr []string
Value interface{}
Out map[string]string
}{
{
// Base list
[]string{"listDeep"},
[]interface{}{
map[string]interface{}{
"thing1": "a",
"thing2": "b",
},
map[string]interface{}{
"thing1": "c",
"thing2": "d",
},
map[string]interface{}{
"thing1": "e",
"thing2": "f",
},
map[string]interface{}{
"thing1": "g",
"thing2": "h",
},
},
map[string]string{
"listDeep.#": "4",
"listDeep.0.thing1": "a",
"listDeep.0.thing2": "b",
"listDeep.1.thing1": "c",
"listDeep.1.thing2": "d",
"listDeep.2.thing1": "e",
"listDeep.2.thing2": "f",
"listDeep.3.thing1": "g",
"listDeep.3.thing2": "h",
},
},
{
// Remove an element
[]string{"listDeep"},
[]interface{}{
map[string]interface{}{
"thing1": "a",
"thing2": "b",
},
map[string]interface{}{
"thing1": "c",
"thing2": "d",
},
map[string]interface{}{
"thing1": "e",
"thing2": "f",
},
},
map[string]string{
"listDeep.#": "3",
"listDeep.0.thing1": "a",
"listDeep.0.thing2": "b",
"listDeep.1.thing1": "c",
"listDeep.1.thing2": "d",
"listDeep.2.thing1": "e",
"listDeep.2.thing2": "f",
},
},
{
// Rewrite with missing keys. This should normally not be necessary, as
// hopefully the writers are writing zero values as necessary, but for
// brevity we want to make sure that what exists in the writer is exactly
// what the last write looked like coming from the provider.
[]string{"listDeep"},
[]interface{}{
map[string]interface{}{
"thing1": "a",
},
map[string]interface{}{
"thing1": "c",
},
map[string]interface{}{
"thing1": "e",
},
},
map[string]string{
"listDeep.#": "3",
"listDeep.0.thing1": "a",
"listDeep.1.thing1": "c",
"listDeep.2.thing1": "e",
},
},
}
w := &MapFieldWriter{Schema: schema}
for n, tc := range values {
err := w.WriteField(tc.Addr, tc.Value)
if err != nil {
t.Fatalf("%d: err: %s", n, err)
}
actual := w.Map()
if !reflect.DeepEqual(actual, tc.Out) {
t.Fatalf("%d: bad: %#v", n, actual)
}
}
}
func TestMapFieldWriterCleanMap(t *testing.T) {
schema := map[string]*Schema{
"map": &Schema{
Type: TypeMap,
},
}
values := []struct {
Value interface{}
Out map[string]string
}{
{
// Base map
map[string]interface{}{
"thing1": "a",
"thing2": "b",
"thing3": "c",
"thing4": "d",
},
map[string]string{
"map.%": "4",
"map.thing1": "a",
"map.thing2": "b",
"map.thing3": "c",
"map.thing4": "d",
},
},
{
// Base map
map[string]interface{}{
"thing1": "a",
"thing2": "b",
"thing4": "d",
},
map[string]string{
"map.%": "3",
"map.thing1": "a",
"map.thing2": "b",
"map.thing4": "d",
},
},
}
w := &MapFieldWriter{Schema: schema}
for n, tc := range values {
err := w.WriteField([]string{"map"}, tc.Value)
if err != nil {
t.Fatalf("%d: err: %s", n, err)
}
actual := w.Map()
if !reflect.DeepEqual(actual, tc.Out) {
t.Fatalf("%d: bad: %#v", n, actual)
}
}
}